// var a = 1; // var b = 1; // var a = b = 1; // oBox.style.display = ‘block‘; // oBg.style.display = ‘block‘; oBox.style.display = oBg.style.display = ‘block‘;
优化代码
原文：http://www.cnblogs.com/q460021417/p/4302685.html
